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    Gravity Wave Variance in LIMS Temperatures. Part I: Variability and Comparison with Background Winds

    Source: Journal of the Atmospheric Sciences:;1994:;Volume( 051 ):;issue: 017::page 2461
    Author:
    Fetzer, Eric J.
    ,
    Gille, John C.
    DOI: 10.1175/1520-0469(1994)051<2461:GWVILT>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Small-scale features in temperature data from the Limb Infrared Monitor of the Stratosphere satellite experiment are isolated by subtracting profiles of globally mapped temperatures (containing zonal waves 0?6) from inverted temperature profiles. These features are interpreted as internal gravity waves. The preponderance of the variance is associated with the longest wavelengths, corresponding to the lowest frequencies (inertio-gravity waves). The data include approximately 2000 daily soundings between late October 1978 and late May 1979, all longitudes, latitudes from about 65°S to 85°N, and altitudes from the tropopause to the middle mesosphere (pressures from 100 to 0.1 mb). Zonal-mean gravity wave variance is compared with background winds, and variance maps are presented for five one-week periods: early November, early January, early February, late March, and early May. Time-height plots of zonal mean wave variance and background winds in the latitude bands 45°?55°S, 5°S?5°N, and 45°?55°N are also presented. Variance ranges from about 2.0 K2 in the northern late spring lower stratosphere to about 315 K2 in the northern late fall mesosphere. The Northern Hemisphere gravity wave variance field undergoes an approximate twofold increase between fall and early winter, but the maximum remains quasi-stationary; during the same period the mesospheric jet moves by several thousand kilometers. The Northern Hemisphere gravity wave field is strongly distorted by the late January minor warming, and decreases gradually between early March and late May. The tropical gravity wave variance is approximately constant with time below 40 km, but shows an increasingly strong semiannual signal above 40 km. The tropical maximum extends through January and February but is confined in altitude near 60 km. Southern Hemisphere variance decreases toward a broad minimum in January and February, but climbs rapidly after the autumnal equinox. The gravity wave variance fields during autumn in the two hemispheres are compared and seen to be quite similar, while large interhemispheric differences exist during spring. Background winds in the autumn hemispheres are also similar, while spring winds are different.
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      Gravity Wave Variance in LIMS Temperatures. Part I: Variability and Comparison with Background Winds

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4157574
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    contributor authorFetzer, Eric J.
    contributor authorGille, John C.
    date accessioned2017-06-09T14:32:26Z
    date available2017-06-09T14:32:26Z
    date copyright1994/09/01
    date issued1994
    identifier issn0022-4928
    identifier otherams-21255.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4157574
    description abstractSmall-scale features in temperature data from the Limb Infrared Monitor of the Stratosphere satellite experiment are isolated by subtracting profiles of globally mapped temperatures (containing zonal waves 0?6) from inverted temperature profiles. These features are interpreted as internal gravity waves. The preponderance of the variance is associated with the longest wavelengths, corresponding to the lowest frequencies (inertio-gravity waves). The data include approximately 2000 daily soundings between late October 1978 and late May 1979, all longitudes, latitudes from about 65°S to 85°N, and altitudes from the tropopause to the middle mesosphere (pressures from 100 to 0.1 mb). Zonal-mean gravity wave variance is compared with background winds, and variance maps are presented for five one-week periods: early November, early January, early February, late March, and early May. Time-height plots of zonal mean wave variance and background winds in the latitude bands 45°?55°S, 5°S?5°N, and 45°?55°N are also presented. Variance ranges from about 2.0 K2 in the northern late spring lower stratosphere to about 315 K2 in the northern late fall mesosphere. The Northern Hemisphere gravity wave variance field undergoes an approximate twofold increase between fall and early winter, but the maximum remains quasi-stationary; during the same period the mesospheric jet moves by several thousand kilometers. The Northern Hemisphere gravity wave field is strongly distorted by the late January minor warming, and decreases gradually between early March and late May. The tropical gravity wave variance is approximately constant with time below 40 km, but shows an increasingly strong semiannual signal above 40 km. The tropical maximum extends through January and February but is confined in altitude near 60 km. Southern Hemisphere variance decreases toward a broad minimum in January and February, but climbs rapidly after the autumnal equinox. The gravity wave variance fields during autumn in the two hemispheres are compared and seen to be quite similar, while large interhemispheric differences exist during spring. Background winds in the autumn hemispheres are also similar, while spring winds are different.
    publisherAmerican Meteorological Society
    titleGravity Wave Variance in LIMS Temperatures. Part I: Variability and Comparison with Background Winds
    typeJournal Paper
    journal volume51
    journal issue17
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1994)051<2461:GWVILT>2.0.CO;2
    journal fristpage2461
    journal lastpage2483
    treeJournal of the Atmospheric Sciences:;1994:;Volume( 051 ):;issue: 017
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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